128444929 has 2 divisors, whose sum is σ = 128444930. Its totient is φ = 128444928.

The previous prime is 128444891. The next prime is 128444933. The reversal of 128444929 is 929444821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93315600 + 35129329 = 9660^2 + 5927^2 .

It is a cyclic number.

It is not a de Polignac number, because 128444929 - 2⁹ = 128444417 is a prime.

It is not a weakly prime, because it can be changed into another prime (128444969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64222464 + 64222465.

It is an arithmetic number, because the mean of its divisors is an integer number (64222465).

Almost surely, 2^128444929 is an apocalyptic number.

It is an amenable number.

128444929 is a deficient number, since it is larger than the sum of its proper divisors (1).

128444929 is an equidigital number, since it uses as much as digits as its factorization.

128444929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 128444929 is about 11333.3547107642. The cubic root of 128444929 is about 504.5516773983.

The spelling of 128444929 in words is "one hundred twenty-eight million, four hundred forty-four thousand, nine hundred twenty-nine".